0g-chain/x/pricefeed/handler.go

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2019-11-25 19:46:02 +00:00
package pricefeed
import (
"fmt"
sdk "github.com/cosmos/cosmos-sdk/types"
)
// NewHandler handles all pricefeed type messages
func NewHandler(k Keeper) sdk.Handler {
return func(ctx sdk.Context, msg sdk.Msg) sdk.Result {
switch msg := msg.(type) {
case MsgPostPrice:
return HandleMsgPostPrice(ctx, k, msg)
default:
errMsg := fmt.Sprintf("unrecognized pricefeed message type: %T", msg)
return sdk.ErrUnknownRequest(errMsg).Result()
}
}
}
// price feed questions:
// do proposers need to post the round in the message? If not, how do we determine the round?
// HandleMsgPostPrice handles prices posted by oracles
func HandleMsgPostPrice(
ctx sdk.Context,
k Keeper,
msg MsgPostPrice) sdk.Result {
// TODO cleanup message validation and errors
err := k.ValidatePostPrice(ctx, msg)
if err != nil {
return err.Result()
}
k.SetPrice(ctx, msg.From, msg.AssetCode, msg.Price, msg.Expiry)
return sdk.Result{}
}
// EndBlocker updates the current pricefeed
func EndBlocker(ctx sdk.Context, k Keeper) {
// TODO val_state_change.go is relevant if we want to rotate the oracle set
// Running in the end blocker ensures that prices will update at most once per block,
// which seems preferable to having state storage values change in response to multiple transactions
// which occur during a block
//TODO use an iterator and update the prices for all assets in the store
k.SetCurrentPrices(ctx)
return
}